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extHeader.go
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extHeader.go
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// Copyright 2020 Johanna Amélie Schander <git@mimoja.de>
package intelfsp
import (
"bytes"
"encoding/binary"
"fmt"
)
type ExtendedFSPHeader struct {
BinaryExtendedFSPHeader
FspProducerData []byte
}
type BinaryExtendedFSPHeader struct {
Signature [4]byte
HeaderLength uint32
Revision uint8
Reserved1 uint8
FspProducerId [6]byte
FspProducerRevision uint32
FspProducerDataSize uint32
}
func ParseExtendedHeader(b []byte) (*ExtendedFSPHeader, error) {
binHeader := BinaryExtendedFSPHeader{}
if len(b) < FixedExtendedInfoHeaderLength {
return nil, fmt.Errorf("short FSP Info Header length %d; want at least %d", len(b), FixedInfoHeaderLength)
}
reader := bytes.NewReader(b)
if err := binary.Read(reader, binary.LittleEndian, &b); err != nil {
return nil, err
}
if !bytes.Equal(binHeader.Signature[:], []byte(FSPExtHeaderSignature)) {
return nil, fmt.Errorf("invalid signature %v (%s); want %s", binHeader.Signature, string(binHeader.Signature[:]), FSPHeaderSignature)
}
if binHeader.Reserved1 != 0x0 {
return nil, fmt.Errorf("reserved bytes must be zero")
}
if uint32(len(b)) < FixedExtendedInfoHeaderLength+binHeader.FspProducerDataSize {
return nil, fmt.Errorf("extended info header size requested 0x%08x bytes", binHeader.FspProducerDataSize)
}
extHeader := ExtendedFSPHeader{
BinaryExtendedFSPHeader: binHeader,
FspProducerData: b[FixedExtendedInfoHeaderLength : FixedExtendedInfoHeaderLength+binHeader.FspProducerDataSize],
}
return &extHeader, nil
}
func (eh ExtendedFSPHeader) Summary() string {
s := fmt.Sprintf("Signature : %s\n", eh.Signature)
s += fmt.Sprintf("Header Length : %d\n", eh.HeaderLength)
s += fmt.Sprintf("Revision : %#02x\n", eh.Revision)
s += fmt.Sprintf("Reserved1 : %#04x\n", eh.Reserved1)
s += fmt.Sprintf("FSP Producer ID : %v\n", eh.FspProducerId)
s += fmt.Sprintf("FSP Producer Revision : %#08x\n", eh.FspProducerRevision)
s += fmt.Sprintf("FSP Producer Data Size : %#08x %d\n", eh.FspProducerDataSize, eh.FspProducerDataSize)
s += fmt.Sprintf("FSP Producer Data : %v\n", eh.FspProducerData)
return s
}